Wehrli 01-04 LB7 Duramax S400 Single Turbo Install Kit - Illusion Blueberry

If you're looking to swap your stock IHI-style turbo for a larger Borg Warner S400 setup on your 2001-2004 6.6L LB7 Duramax diesel, this single turbo install kit from Wehrli Custom Fabrication is what you need. This kit is designed to replace your restrictive factory components with high-flow parts, aiming for maximum horsepower and efficiency gains. It's a comprehensive package that simplifies the transition to a more powerful turbo system.

This kit includes a new 5-inch fabricated aluminum intake with a heavy-duty sheet metal air box and a high-performance dry filter, complete with a pre-filter cover. The intercooler hot and cold side charge pipes are updated to 3-inch diameter, mandrel-bent aluminum tubing for better airflow. You also get an upgraded 3-inch fabricated billet y-bridge kit, which replaces the stock upper intake manifold to further improve air delivery into the engine. For oil supply, the kit uses high-quality stainless steel braided Parker lines, with the feed line routing directly from the engine block's main oil galley. The kit also features a T4 fabricated steel pedestal and spacer, designed to work with 2-inch high-flow stainless steel up-pipes. The included high-temperature ceramic-coated turbo downpipe connects directly to your existing exhaust front pipe using a V-band clamp, meaning no cutting or modifications are needed for your exhaust system. A driver-side transmission dipstick tube is also included to make installing the downpipe easier.

The kit comes complete with silicone boots, stainless steel T-bolt clamps, V-band clamps, and heat wrap. The piping is finished in a custom powder coat, in this case, Illusion Blueberry, for a unique look. While the turbocharger itself is sold separately, this kit provides all the necessary plumbing and mounting hardware to integrate a popular S400-style turbo. If you're not purchasing a Borg Warner turbo from Wehrli, be sure to provide the details of your chosen turbo so they can ensure proper fitment for your kit.